5661660555550 has 24 divisors (see below), whose sum is σ = 10532215683000. Its totient is φ = 2264335824480.

The previous prime is 5661660555427. The next prime is 5661660555559. The reversal of 5661660555550 is 555550661665.

It is a junction number, because it is equal to n+sod(n) for n = 5661660555491 and 5661660555500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661660555559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7861545 + ... + 8551444.

It is an arithmetic number, because the mean of its divisors is an integer number (438842320125).

Almost surely, 2^{5661660555550} is an apocalyptic number.

5661660555550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

5661660555550 is a deficient number, since it is larger than the sum of its proper divisors (4870555127450).

5661660555550 is a wasteful number, since it uses less digits than its factorization.

5661660555550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16419900 (or 16419895 counting only the distinct ones).

The product of its (nonzero) digits is 20250000, while the sum is 55.

The spelling of 5661660555550 in words is "five trillion, six hundred sixty-one billion, six hundred sixty million, five hundred fifty-five thousand, five hundred fifty".